Larger than any of the factions headquarters, the Supergun fires radioactive shells larger than an ANAbrams Tank. Capable of firing on targets all the way to Tokyo, Japan and Seoul, South Korea with its 50 foot long barrel, the Supergun is a power to be feared. The Supergun project was headed by Ji An.

Interior of the Supergun prototype

Three versions of this weapon can be seen in game, two Prototypes, and one true supergun. One Prototype is hidden behind The Black Gate, under the watch of the Jack of Diamonds while the other Prototype and the Supergun itself, are only found on Kirin-Do Island. Both the Type-07 and it's Prototypes are heavily armored, and require a powerful weapon, such as Bunker Buster, Cruise Missile, or a round from another Type-07 to destroy them. The Type-07 proper also has a built in jammer to make calling air-strikes on it impossible, but is conveniently located within range of its prototype.

The Type-07 Super Gun is supposedly inspired by the Iraqi Project Babylon Supergun, which could launch WMD and Conventional shells as far as Israel. Despite this, it has very little in common with the actual Project Babylon. In fact, it looks like and shares characteristics with conventional artillery cannons, but on a much more massive scale.

During the WWII, the German army tried to make weapons like this. Many simple railway artillery pieces were used but by far the largest was the "Schwerer Gustav" Dora Railgun which fired an 800.mm Shell, it was used mainly on the eastern front. The Landkreuzer P.1500 Monster was a tank ordered by Hitler to destroy heavily fortified targets. The projects were cancelled due to the problems with the vehicles. They tried to build 3 such vehicles. The Panzerkampfwagen Maus, Landkreuzer P. 1000 Ratte and Landkreuzer P. 1500 Monster

Considering the fact that while stationed on Kirin-Do island and was mentioned able to hit targets as far as Japan, gives us an estimate that the supergun has a range in the thousands of kilometres. As central Japan and Kirin-Do have a distance of just shy of 1200km, it's pretty safe to assume it can likely hit targets even further with radioactive ammo.